This is where the harmonic balancer comes in. The circular device, made of rubber and metal, is bolted at the front end of the crankshaft to help absorb vibrations. It's usually connected to the crank pulley, which drives accessories like the air conditioner.
Additional costs: Ground water wells can also be tested for radon, then, if needed, can get a water radon mitigation system installed. Installing a water radon mitigation system runs from $1,000-$4,500, and maintenance runs $0 to $150 annually.
Depending on the size of dam structure construction costs will vary, however, this form of flood mitigation is typically one of the more costly. Large dam projects can cost anywhere between $1 and $6.5 billion [4] while smaller dams will cost less. Construction times vary depending on the dam project. For example, the large Hoover Dam in Nevada took five years to construct while the Glenmore Reservoir and Dam in Calgary took one year to construct [5] [6] .